自由基从双环[2.2.0]己烷中的桥位和桥头位都提取氢(4)。通过epr光谱法观察到双环[2.2.0]己烷-1-基。双环[2.2.0]己-2-基通过立体电子禁止的β-断裂重排,得到环己-3-烯基。与其他环丁烷不同,化合物(4)与溴原子进行S H 2反应。自由基夺取氢仅从C的亚甲基基团5环双环[3.2.0]庚烷(15A)。通过epr光谱法观察到双环[3.2.0]庚-2-基,以及通过立体电子允许的β-断裂将其重排为2-(环戊-2-烯基)乙基。溴原子从(15a)提取氢,未检测到S H 2反应。使用半经验MINDO / 3和MNDO方法研究了自由基及其重排。
Palladium- and Ruthenium-Catalyzed Cycloisomerization of Enynamides and Enynhydrazides: A Rapid Approach to Diverse Azacyclic Frameworks
作者:P. Ross Walker、Craig D. Campbell、Abid Suleman、Greg Carr、Edward A. Anderson
DOI:10.1002/anie.201304186
日期:2013.8.26
I want to ride my azacycle: The title reaction of enynamides affords a wide diversity of azacycles. The reactions are high‐yielding, highly stereoselective, and proceed rapidly under mild reaction conditions. Equivalent transformations using enynhydrazides offer new routes to pyrazole and indazole scaffolds. Boc=tert‐butoxycarbonyl, EWG=electron‐withdrawing group, Ns=4‐nitrobenzenesulfonyl, Ts=4‐toluenesulfonyl
Convenient One‐Pot Synthesis of Vinyl Ethers from Phenyl 2‐Hydroxyalkyl Selenides
作者:Shou‐Ri Sheng、Hai‐Rong Luo、Wu‐Kang Sun、Xiao‐Ling Liu、Qin Xin、Qiu‐Ying Wang
DOI:10.1080/00397910500296901
日期:2005.11
Abstract Vinylethers were prepared with good yields in a one‐pot, two‐step transformation by O‐alkylation reaction of phenyl 2‐hydroxyalkyl selenides with primary or secondary organic halides followed by oxidation elimination with 30% hydrogen peroxide.
Pyrolysis of allyl ethers. Unimolecular fragmentation to propenes and carbonyl compounds
作者:R. C. Cookson、S. R. Wallis
DOI:10.1039/j29660001245
日期:——
about 500° allylethers undergo decomposition through a cyclic, six-atom transition state with transfer of a hydrogen atom to give high yields of a carbonylcompound and a propene, in which the double bond has moved from the 2,3- to the 1,2-position of the allyl system. The rate of reaction is rather insensitive to structural variation in either the allyl or alkyl part of the ether. Allyl α-deuterodiphenylmethyl
A number of 1,4-elimination reactions proceeding with concomitant fragmentation according to scheme (1) are reviewed. It is pointed out that one of the simplest cases of this mechanistic type has hitherto remained unnoticed, viz. the elimination of halogen from saturated 1,4-dihalides with formation of two olefinic bonds according to scheme (11).
Production method of 2-cyclohexyl-
2-hydroxy-2-phenylacetic acid
intermediate therefor and production method thereof
申请人:Sumika Fine Chemicals Co., Ltd.
公开号:US20030013911A1
公开(公告)日:2003-01-16
The present invention relates to production of 2-cyclohexyl-2-hydroxy-2-phenylacetic acid useful as an intermediate for pharmaceutical products, by an industrial means, economically, safely in a good yield. Novel 2-(2′-cyclohexen-1′-yl)-2-hydroxy-2-phenylacetic acid ester obtained by reacting cyclohexene and benzoylformic acid ester in the presence of a Lewis acid is hydrolyzed and reduced to give 2-cyclohexyl-2-hydroxy-2-phenylacetic acid.